pay heed vs fixate

pay heed and fixate both are verbs.

Word	Noun	Adjective	Verb	Adverb
pay heed	No	No	Yes	No
fixate	No	No	Yes	No

As verbs, fixate is a hyponym of pay heed; that is, fixate is a word with a more specific, narrower meaning than pay heed:

pay heed (verb)	fixate (verb)
give heed (to)	become fixed (on)
	make fixed, stable or stationary
	pay attention to exclusively and obsessively
	attach (oneself) to a person or thing in a neurotic way