skimming vs removal

skimming and removal both are nouns.

Word	Noun	Adjective	Verb	Adverb
skimming	Yes	No	No	No
removal	Yes	No	No	No

As nouns, removal is a hypernym of skimming; that is, removal is a word with a broader meaning than skimming:

skimming: the act of removing floating material from the surface of a liquid
removal: the act of removing

Other hypernyms of skimming include remotion.

skimming (noun)	removal (noun)
the act of removing floating material from the surface of a liquid	the act of removing
failure to declare income in order to avoid paying taxes on it	dismissal from office
the act of brushing against while passing
reading or glancing through quickly