Community is a noun.
There is no piece of legislation called the Category of Speech Act. However, a speech act is a linguistics term used to describe an utterance that has a function as a performance of communicating something.
Channels are by which a message is communicated. Examples would be radio, television and phone, etc. Its anything that is a way of how the person is communicating his or her speech.
part of speech
The part of speech for this particular word is a noun.
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
These are both part of the process of communicating.
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.