waterer vs helper

waterer and helper both are nouns.

Word	Noun	Adjective	Verb	Adverb
waterer	Yes	No	No	No
helper	Yes	No	No	No

As nouns, helper is a hypernym of waterer; that is, helper is a word with a broader meaning than waterer:

waterer: an assistant who supplies drinking water
helper: a person who contributes to the fulfillment of a need or furtherance of an effort or purpose

Other hypernyms of waterer include assistant, help, supporter.

waterer (noun)	helper (noun)
an assistant who supplies drinking water	a person who helps people or institutions (especially with financial help)
someone who waters plants or crops	a person who contributes to the fulfillment of a need or furtherance of an effort or purpose