sing vs troll

sing is not a noun while troll is a noun.

Word	Noun	Adjective	Verb	Adverb
sing	No	No	Yes	No
troll	Yes	No	Yes	No

As verbs, troll is a hyponym of sing; that is, troll is a word with a more specific, narrower meaning than sing:

As verbs, troll is a hyponym of sing; that is, troll is a word with a more specific, narrower meaning than sing:

Other hyponyms of sing include solmizate, hymn, carol, madrigal.

sing (noun)	troll (noun)
	angling by drawing a baited line through the water
	a fisherman's lure that is used in trolling
	a partsong in which voices follow each other; one voice starts and others join in one after another until all are singing different parts of the song at the same time
	(Scandinavian folklore) a supernatural creature (either a dwarf or a giant) that is supposed to live in caves or in the mountains

sing (verb)	troll (verb)
make a whining, ringing, or whistling sound	sing loudly and without inhibition
divulge confidential information or secrets	praise or celebrate in song
to make melodious sounds	speak or recite rapidly or in a rolling voice
produce tones with the voice	angle with a hook and line drawn through the water
deliver by singing	sing the parts of (a round) in succession
	cause to move round and round
	circulate, move around