electronic image vs bitmap

electronic image and bitmap both are nouns.

Word	Noun	Adjective	Verb	Adverb
electronic image	Yes	No	No	No
bitmap	Yes	No	No	No

As nouns, electronic image and bitmap are synonyms defined as:

electronic image and bitmap: an image represented as a two dimensional array of brightness values for pixels

electronic image (noun)	bitmap (noun)
an image represented as a two dimensional array of brightness values for pixels	an image represented as a two dimensional array of brightness values for pixels