indentation vs corroding

indentation and corroding both are nouns.

Word	Noun	Adjective	Verb	Adverb
indentation	Yes	No	No	No
corroding	Yes	No	No	No

As nouns, corroding is a hypernym of indentation; that is, corroding is a word with a broader meaning than indentation:

indentation: the formation of small pits in a surface as a consequence of corrosion
corroding: erosion by chemical action

Other hypernyms of indentation include corrosion, erosion.

indentation (noun)	corroding (noun)
the act of cutting into an edge with toothlike notches or angular incisions	erosion by chemical action
the space left between the margin and the start of an indented line
the formation of small pits in a surface as a consequence of corrosion
a concave cut into a surface or edge (as in a coastline)