blacking vs polish

blacking and polish both are nouns.

Word	Noun	Adjective	Verb	Adverb
blacking	Yes	No	No	No
polish	Yes	No	Yes	No

As nouns, polish is a hypernym of blacking; that is, polish is a word with a broader meaning than blacking:

blacking: a substance used to produce a shiny protective surface on footwear
polish: a preparation used in polishing

blacking (noun)	polish (noun)
a substance used to produce a shiny protective surface on footwear	the property of being smooth and shiny
	a highly developed state of perfection; having a flawless or impeccable quality
	a preparation used in polishing

blacking (verb)	polish (verb)
	bring to a highly developed, finished, or refined state
	improve or perfect by pruning or polishing
	make (a surface) shine