sensitise vs picture taking

sensitise is not a noun while picture taking is a noun.

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

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

sensitise (verb)	picture taking (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