portraiture vs picture

portraiture and picture both are nouns.

Word	Noun	Adjective	Verb	Adverb
portraiture	Yes	No	No	No
picture	Yes	No	Yes	No

As nouns, picture is a hypernym of portraiture; that is, picture is a word with a broader meaning than portraiture:

Other hypernyms of portraiture include characterisation, characterization, delineation, depiction, word-painting, word picture.

portraiture (noun)	picture (noun)
the activity of making portraits	a visual representation (of an object or scene or person or abstraction) produced on a surface
a word picture of a person's appearance and character	graphic art consisting of an artistic composition made by applying paints to a surface
	a representation of a person or scene in the form of a print or transparent slide or in digital format
	a clear and telling mental image
	a typical example of some state or quality
	illustrations used to decorate or explain a text
	the visible part of a television transmission
	a form of entertainment that enacts a story by sound and a sequence of images giving the illusion of continuous movement
	a graphic or vivid verbal description
	a situation treated as an observable object

portraiture (verb)	picture (verb)
	show in, or as in, a picture
	imagine; conceive of; see in one's mind