transmitting vs posting

transmitting and posting both are nouns.

Word	Noun	Adjective	Verb	Adverb
transmitting	Yes	No	No	No
posting	Yes	No	No	No

As nouns, posting is a hyponym of transmitting; that is, posting is a word with a more specific, narrower meaning than transmitting:

transmitting: the act of sending a message; causing a message to be transmitted
posting: the transmission of a letter

Other hyponyms of transmitting include forwarding, mailing, telephotography.

transmitting (noun)	posting (noun)
the act of sending a message; causing a message to be transmitted	the transmission of a letter
	a sign posted in a public place as an advertisement
	(bookkeeping) a listing on the company's records