mason's level vs spirit level

mason's level and spirit level both are nouns.

Word	Noun	Adjective	Verb	Adverb
mason's level	Yes	No	No	No
spirit level	Yes	No	No	No

As nouns, spirit level is a hypernym of mason's level; that is, spirit level is a word with a broader meaning than mason's level:

mason's level: a level longer than a carpenter's level
spirit level: indicator that establishes the horizontal when a bubble is centered in a tube of liquid

Other hypernyms of mason's level include level.

mason's level (noun)	spirit level (noun)
a level longer than a carpenter's level	indicator that establishes the horizontal when a bubble is centered in a tube of liquid