fossil vs fossilize

fossil is a noun but fossilize is not a noun.

Word	Noun	Adjective	Verb	Adverb
fossil	Yes	Yes	No	No
fossilize	No	No	Yes	No

fossil (noun)	fossilize (noun)
the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil
someone whose style is out of fashion

fossil (adjective)	fossilize (adjective)
characteristic of a fossil

fossil (verb)	fossilize (verb)
	convert to a fossil
	become mentally inflexible