squandering vs wastefulness

squandering and wastefulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
squandering	Yes	No	No	No
wastefulness	Yes	No	No	No

As nouns, wastefulness is a hypernym of squandering; that is, wastefulness is a word with a broader meaning than squandering:

squandering: spending resources lavishly and wastefully
wastefulness: useless or profitless activity; using or expending or consuming thoughtlessly or carelessly

Other hypernyms of squandering include dissipation, waste.

squandering (noun)	wastefulness (noun)
spending resources lavishly and wastefully	useless or profitless activity; using or expending or consuming thoughtlessly or carelessly
	the trait of wasting resources