picture taking vs sensitize

picture taking is a noun but sensitize is not a noun.

Word	Noun	Adjective	Verb	Adverb
picture taking	Yes	No	No	No
sensitize	No	No	Yes	No

picture taking (noun)	sensitize (noun)
the act of taking and printing photographs

picture taking (verb)	sensitize (verb)
	make sensitive or aware
	make (a material) sensitive to light, often of a particular colour, by coating it with a photographic emulsion
	make sensitive to a drug or allergen
	cause to sense; make sensitive