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A vertical bilingual is someone whose second language is acquired at the expense of the aptitudes already acquired in the first language.

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A subtractive bilingual is someone whose second language is acquired at the expense of the aptitudes already acquired in the first language.

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A subordinate bilingual is someone who exhibits interference in his or her language usage by reducing the patterns of the second language to those of the first.

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a simultaneous bilingual is someone whose two languages are present from the onset of speech.

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A secondary bilingual is someone whose second language has been added to a first language via instruction.

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A recessive bilingual is someone who begins to feel some difficulty in either understanding or expressing him or herself with ease, due to lack of use.

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A productive bilingual is someone who not only understands but also speaks and possibly writes in two or more languages.

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A natural bilingual is someone who has not undergone any specific training and who is often not in a position to translate or interpret with facility between two languages.

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A minimal bilingual is someone with only a few words and phrases in a second language

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A maximal bilingual is someone with near-native control of two or more languages.

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An incipient bilingual is someone at the early stages of bilingualism where one language is not fully developed

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A horizontal bilingual is someone who is bilingual in two distinct languages which have a similar or equal status

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A functional bilingual is someone who can operate in two languages with or without full fluency for the task in hand.

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A dormant bilingual is someone who has emigrated to a foreign country for a considerable period of time and has little opportunity to keep the first language actively in use.

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A dominant bilingual is someone with greater proficiency in one of his or her languages and uses it significantly more than the other language(s).

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A diagonal bilingual is someone who is bilingual in a nonstandard language or a dialect and an unrelated standard language.

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A covert bilingual is someone who conceals his or her knowledge of a given language due to an attitudinal disposition.

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A coordinate bilingual is someone whose two languages are learned in distinctively separate contexts.

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It is also called successive bilingual.
A consecuitive bilingual is someone whose second language is added at some stage after the first has begun to develop.

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A compound bilingual is someone whose two languages are learned at the same time, often in the same context.

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It is also called receptive bilingual.
An asymmetrical bilingual is someone who understands a second language, in either its spoken or written form, or both, but does not necessarily speak or write it.

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It is also called early bilingual.
An ascribed bilingual is someone who has acquired two languages early in childhood.

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An ascendant bilingual is someone whose ability to function in a second language is developing due to increased use.

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It is also called balanced bilingual.
An ambilingual is someone
whose mastery of two languages is roughly equivalent.

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Additive bilingual is someone whose two languages combine in a complementary and enriching fashion.

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It is also called late bilingual.
Someone is a late bilingual if he or she has become a bilingual later than childhood.