Meaning: A synecdoche  is a figure of speech in which a term for a part of something refers to the whole of something or vice versa.

       The phrase “ever-fixed mark”           refers to a lighthouse.

        Which yet survive, stamped on          these lifeless things,                          The hand that mocked them.”

“The hand” in these lines refers to the sculptor, who carved the “lifeless things” into a grand statue.

In reading, the delay of meaning creates a tension that is released when the word or phrase that completes the syntax is encountered (called the rejet); the tension arises from the "mixed message" produced both by the pause of the line-end, and the suggestion to continue provided by the incomplete meaning. In spite of the apparent contradiction between rhyme, which heightens closure, and enjambment, which delays it, the technique is compatible with rhymed verse. Even in couplets, the closed or heroic couplet was a late development; older is the open couplet, where rhyme and enjambed lines co-exist.

Enjambment has a long history in poetry. Homer used the technique, and it is the norm for alliterative verse where rhyme is unknown. In the 32nd Psalm of the Hebrew Bible enjambment is unusually conspicuous. It was used extensively in England by Elizabethan poets for dramatic and narrative verses, before giving way to closed couplets. The example of John Milton in Paradise Lost laid the foundation for its subsequent use by the English Romantic poets; in its preface he identified it as one of the chief features of his verse: "sense variously drawn out from one verse into another".

Short Examples of Enjambment

2 ‘bubble reputation’ for ephemeral nature of fame in the world

3 ‘lean and slippered pantaloon’ for getting old

4 ‘youthful hose…shrunk shank’ (considering Shakespeare's flair for fun) for one's receding virility

5 ‘strange eventful history’ for one’s course of life.

Poetic Device- Antithesis
Antithesis is used in writing or speech as a proposition that contrasts with some previously mentioned proposition.
Examples:
1.Man proposes, God disposes.
2.Speech is silver, but silence is gold.

And no one can talk to a horse of course
*the art of losing is hard to master
so many things seem filled with the intent
to be lost that their loss is no disaster…https://www.youtube.com/watch?v=tH7yXFfV7PI

of the bells, bells, bells-

Of the bells, bells, bells, bells

Bells, bells, bells-

As a literary device, inversion refers to the reversal of the syntactically correct order of subjects, verbs, and objects in a sentence. ... For example, if a poet were writing in iambic pentameter and used a trochee instead of an iamb in one of the lines, that would be considered inversion.

The ocean blue

To the store, I will go.

A cat, fluffy and fat

My teacher, kind and generous

Writes the girl

The same vowel sound of the short vowel “-e-” repeats itself in almost all the words, excluding the definite article. The words do share the same vowel sounds, but start with different consonant sounds – unlike alliteration,  which involves repetition of the same consonant sounds.
EXAMPLE

SUNNY DAY FUN POEM
The sun is shining high in the sky.
Ice cream is dripping down my cone.
I smile at my mother's sigh.
Hurry and eat so we can go to the fun zone.

The assonance is so subtle that sometimes it's hard to find. In this poem, shining, high, sky, ice, smile and sigh all have the long i sound. In the last line, so, go and zone all have the long o sound.