colloquial vs conversational

colloquial and conversational both are adjectives.

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

As adjectives, colloquial and conversational are synonyms defined as:

colloquial and conversational: characteristic of informal spoken language or conversation

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