idea vs scalage

idea and scalage both are nouns.

Word	Noun	Adjective	Verb	Adverb
idea	Yes	No	No	No
scalage	Yes	No	No	No

As nouns, scalage is a hyponym of idea; that is, scalage is a word with a more specific, narrower meaning than idea:

idea (noun)	scalage (noun)
the content of cognition; the main thing you are thinking about	the act of scaling in weight or quantity or dimension
your intention; what you intend to do	estimation of the amount of lumber in a log
an approximate calculation of quantity or degree or worth
a personal view
(music) melodic subject of a musical composition