dull vs alter

dull is an adjective but alter is not an adjective.

Word	Noun	Adjective	Verb	Adverb
dull	No	Yes	Yes	No
alter	No	No	Yes	No

As verbs, alter is a hypernym of dull; that is, alter is a word with a broader meaning than dull:

Other hypernyms of dull include change, modify.

As verbs, alter is a hypernym of dull; that is, alter is a word with a broader meaning than dull:

Other hypernyms of dull include change, modify.

dull (adjective)	alter (adjective)
not having a sharp edge or point
emitting or reflecting very little light
lacking in liveliness or animation
not keenly felt
darkened with overcast
(of business) not active or brisk
blunted in responsiveness or sensibility
being or made softer or less loud or clear
slow to learn or understand; lacking intellectual acuity
not clear and resonant; sounding as if striking with or against something relatively soft
(of color) very low in saturation; highly diluted
so lacking in interest as to cause mental weariness

dull (verb)	alter (verb)
become dull or lusterless in appearance; lose shine or brightness	remove the ovaries of
make less lively or vigorous	become different in some particular way, without permanently losing one's or its former characteristics or essence
become less interesting or attractive	cause to change; make different; cause a transformation
make dull in appearance	insert words into texts, often falsifying it thereby
make dull or blunt	make an alteration to
deaden (a sound or noise), especially by wrapping
make numb or insensitive