According to dictionaries, "inchoative" and "inchoate" are both adjectives and both denote "initial". I couldn't find slightest difference between them. So I was wondering can they be used interchangeably or are they different in some ways?
It would be grammatically acceptable to use the adjective "inchoative" instead of "inchoate" in a given context. This usage, however, probably wouldn't sound very natural, as the adjective "inchoative" has always been chiefly used in reference to grammar.
In the same way, "inchoate" can be used instead of "inchoative" only if "inchoative" is not pointing to "inchoative verbs".
Thanks to Janus Bahs Jacquet whose useful comment you can be found above this answer.