humble vs abase

humble is an adjective but abase is not an adjective.

Word	Noun	Adjective	Verb	Adverb
humble	No	Yes	Yes	No
abase	No	No	Yes	No

As verbs, humble and abase are synonyms defined as:

Other synonyms of humble include chagrin, humiliate, mortify.

humble (adjective)	abase (adjective)
marked by meekness or modesty; not arrogant or prideful
low or inferior in station or quality
of low birth or station (`base' is archaic in this sense)
used of unskilled work (especially domestic work)

humble (verb)	abase (verb)
cause to feel shame; hurt the pride of	cause to feel shame; hurt the pride of
cause to be unpretentious