Octocorallian is a synonym of octocoral.

As a noun octocoral is

(coral science) an anthozoan of the subclass alcyonaria, having eight-branched tentacles and eight septa.

Octocoral is a synonym of octocoralline.

Octocoralline is often a misspelling of octocoral.

Octocoralline has no English definition.

As a noun octocoral is

an anthozoan of the subclass Alcyonaria, having eight-branched tentacles and eight septa.

As nouns the difference between substitute and arsoles

is that substitute is a replacement or stand-in for something that achieves a similar result or purpose while arsoles is any of a number of substituted analogs of arsole; arsole-like chemicals.

As a verb substitute

is to use in place of something else, with the same function.

As an adjective analog

is analogue (being represented by a continuously variable physical quantity).

As a noun arsoles is

any of a number of substituted analogs of arsole; arsole-like chemicals.

As nouns the difference between arsole and arsoles

is that arsole is an unsaturated, five-membered heterocyclic compound of arsenic, C₄H₅As; any substituted form of this compound while arsoles is any of a number of substituted analogs of arsole; arsole-like chemicals.

As a proper noun anthozoa

is .

As a noun anthozoan is

(marine biology) a marine invertebrate of the class anthozoa, such as a sea anemone or coral.

As a proper noun coral

is .

As a noun anthozoan is

(marine biology) a marine invertebrate of the class anthozoa, such as a sea anemone or coral.

Anthozoic is a related term of anthozoan.

As an adjective anthozoic

is of or pertaining to the anthozoa.

As a noun anthozoan is

(marine biology) a marine invertebrate of the class anthozoa, such as a sea anemone or coral.

As nouns the difference between polyp and corallite

is that polyp is an abnormal growth protruding from a mucous membrane while corallite is the hard outer cup of a coral polyp.

As nouns the difference between diatom and theca

is that diatom is a group of minute unicellular algae having a siliceous covering of great delicacy, now categorized as class class: Diatomophyceae or division Bacillariophyta, formerly all included in the order order: Diatomaceae, now obsolete while theca is any external case or sheath.