pixel vs picture element

pixel and picture element both are nouns.

Word	Noun	Adjective	Verb	Adverb
pixel	Yes	No	No	No
picture element	Yes	No	No	No

As nouns, pixel and picture element are synonyms defined as:

pixel and picture element: (computer science) the smallest discrete component of an image or picture on a CRT screen (usually a colored dot)

Other synonyms of pixel include pel.

pixel (noun)	picture element (noun)
(computer science) the smallest discrete component of an image or picture on a CRT screen (usually a colored dot)	(computer science) the smallest discrete component of an image or picture on a CRT screen (usually a colored dot)