I have never heard the word before, so I had to look it up. Dictionary.com says:
Main Entry: conversate
Part of Speech: v
Definition: to socialize and chat; to converse with another
Etymology: back-formation from conversation
As for your issue:
"perhaps we can conversate later! "
"Conversate" isnt being used as a noun there. "Can" is just a module auxiliary for the verb "conversate"
A verb characteristically used with other verbs to express mood or tense. In English, the modal auxiliaries are can, may, must, ought, shall, should, will, and would.
Also, "conversate" appears to be used as a intransitive verb, not a transitive verb. A transitive verb requires an object to complete its meaning. "perhaps we can conversate later! " There is no object in that sentence and yet the meaning is complete.
A verb that does not need a direct object to complete its meaning. Run, sleep, travel, wonder, and die are all intransitive verbs.
A verb that needs a direct object to complete its meaning. Bring, enjoy, and prefer are transitive verbs.
Note: Some verbs can be transitive in one sentence and intransitive in another: turned is transitive in “Brenda turned the wheel sharply” but intransitive in “Fred turned when I called.”