heighten vs fan

heighten is not a noun while fan is a noun.

Word	Noun	Adjective	Verb	Adverb
heighten	No	No	Yes	No
fan	Yes	No	Yes	No

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

Other hyponyms of heighten include heat up, hot up, screw up, enhance, heighten, raise, amplify, sharpen, heighten, sharpen.

heighten (noun)	fan (noun)
	a device for creating a current of air by movement of a surface or surfaces
	an ardent follower and admirer
	an enthusiastic devotee of sports

heighten (verb)	fan (verb)
increase the level of	make (an emotion) fiercer
become more extreme	blow away or off with a current of air
make more extreme; raise in quantity, degree, or intensity	strike out (a batter), (of a pitcher)
make more intense, stronger, or more marked	agitate the air
make (one's senses) more acute
increase the height of