conversational vs colloquial

conversational and colloquial both are adjectives.

Word	Noun	Adjective	Verb	Adverb
conversational	No	Yes	No	No
colloquial	No	Yes	No	No

As adjectives, conversational and colloquial are synonyms defined as:

conversational and colloquial: characteristic of informal spoken language or conversation

conversational (adjective)	colloquial (adjective)
characteristic of informal spoken language or conversation	characteristic of informal spoken language or conversation