shoal vs alter

shoal is a noun but alter is not a noun.

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

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

Other hypernyms of shoal include change, modify.

shoal (noun)	alter (noun)
a large group of fish
a stretch of shallow water
a sandbank in a stretch of water that is visible at low tide

shoal (verb)	alter (verb)
become shallow	remove the ovaries of
make shallow	become different in some particular way, without permanently losing one's or its former characteristics or essence
	cause to change; make different; cause a transformation
	insert words into texts, often falsifying it thereby
	make an alteration to