meterstick vs ruler

meterstick and ruler both are nouns.

Word	Noun	Adjective	Verb	Adverb
meterstick	Yes	No	No	No
ruler	Yes	No	No	No

As nouns, ruler is a hypernym of meterstick; that is, ruler is a word with a broader meaning than meterstick:

meterstick: a rule one meter long (usually marked off in centimeters and millimeters)
ruler: measuring stick consisting of a strip of wood or metal or plastic with a straight edge that is used for drawing straight lines and measuring lengths

Other hypernyms of meterstick include rule.

meterstick (noun)	ruler (noun)
a rule one meter long (usually marked off in centimeters and millimeters)	measuring stick consisting of a strip of wood or metal or plastic with a straight edge that is used for drawing straight lines and measuring lengths
	a person who rules or commands