Die Frauen antwort does not make sense.
Die Frauenantwort could work and mean "the woman answer", as in "the answer that pertains to women". It's not a whole sentence, just a noun with its article. (What is it? An answer. What kind of an answer is it? A woman answer.)
Antwort is a noun meaning an answer.
antworten is a verb form meaning (here) "(they) answer".
So Die Frauen antworten. is a complete sentence meaning "The women answer.", with "answer" being the verb here, describing what they are doing. (What do they women do? They answer.)