channel vs liaison

channel and liaison both are nouns.

Word	Noun	Adjective	Verb	Adverb
channel	Yes	No	Yes	No
liaison	Yes	No	No	No

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

Other hyponyms of channel include back channel, lens, contact, inter-group communication, link, line of gab, patter, spiel.

channel (noun)	liaison (noun)
a way of selling a company's product either directly or via distributors	a channel for communication between groups
a passage for water (or other fluids) to flow through	a usually secretive or illicit sexual relationship
a television station and its programs
a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance
a path over which electrical signals can pass
(often plural) a means of communication or access
a deep and relatively narrow body of water (as in a river or a harbor or a strait linking two larger bodies) that allows the best passage for vessels
a long narrow furrow cut either by a natural process (such as erosion) or by a tool (as e.g. a groove in a phonograph record)

channel (verb)	liaison (verb)
send from one person or place to another
direct the flow of
transmit or serve as the medium for transmission