interlocutor vs conversational partner

interlocutor and conversational partner both are nouns.

Word	Noun	Adjective	Verb	Adverb
interlocutor	Yes	No	No	No
conversational partner	Yes	No	No	No

As nouns, interlocutor and conversational partner are synonyms defined as:

interlocutor and conversational partner: a person who takes part in a conversation

interlocutor (noun)	conversational partner (noun)
a person who takes part in a conversation	a person who takes part in a conversation
the performer in the middle of a minstrel line who engages the others in talk