indentation vs pitting

indentation and pitting both are nouns.

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

As nouns, indentation and pitting are synonyms defined as:

indentation and pitting: the formation of small pits in a surface as a consequence of corrosion

Other synonyms of indentation include roughness.

indentation (noun)	pitting (noun)
the act of cutting into an edge with toothlike notches or angular incisions	the formation of small pits in a surface as a consequence of corrosion
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)