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Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work The Realm of the Nebulae and, as such, form part of the Hubble sequence.

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An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy. Irregular galaxies do not fall into any of the regular classes of the Hubble sequence, and they are often chaotic in appearance. They have no defined shape nor structure and may have formed from collisions, close encounters with other galaxies or violent internal activity.

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A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars. ... Edwin Hubble classified spiral galaxies of this type as "SB" (spiral, barred)

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An e0 tends to look more round compared to an e3 and e7.

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Most spiral galaxies contain a central bulge surrounded by a flat, rotating disk of stars. The bulge in the center is made up of older, dimmer stars, and is thought to contain a supermassive black hole.

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An e3 is less round but not as long or thin as e7.

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E7 galaxies on the other hand are long and narrow.

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Elliptical galaxies are formed whenever two spirals collide, lose their shape, and eventually form a Elliptical Galaxy. Since these stars are born from collision they can be commonly found around clusters of other galaxies.

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An unbarred spiral galaxy is a type of spiral galaxy without a central bar, or one that is not a barred spiral galaxy. It is designated with an SA in the galaxy morphological classification scheme. -Kevin Medina

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An lrr-ll galaxy (Irr II) is an irregular galaxy that does not appear to feature any structure that can place it into the Hubble sequence