bitmap vs ikon

bitmap and ikon both are nouns.

Word	Noun	Adjective	Verb	Adverb
bitmap	Yes	No	No	No
ikon	Yes	No	No	No

As nouns, ikon is a hypernym of bitmap; that is, ikon is a word with a broader meaning than bitmap:

bitmap: an image represented as a two dimensional array of brightness values for pixels
ikon: a visual representation (of an object or scene or person or abstraction) produced on a surface

Other hypernyms of bitmap include icon, image, picture.

bitmap (noun)	ikon (noun)
an image represented as a two dimensional array of brightness values for pixels	a visual representation (of an object or scene or person or abstraction) produced on a surface
	a conventional religious painting in oil on a small wooden panel; venerated in the Eastern Church