redden vs colourize

redden and colourize both are verbs.

Word	Noun	Adjective	Verb	Adverb
redden	No	No	Yes	No
colourize	No	No	Yes	No

As verbs, colourize is a hypernym of redden; that is, colourize is a word with a broader meaning than redden:

Other hypernyms of redden include color, color in, colorise, colorize, colour, colour in, colourise.

redden (verb)	colourize (verb)
turn red, as if in embarrassment or shame	add color to
turn red or redder
make red