frugal vs economical

frugal and economical both are adjectives.

Word	Noun	Adjective	Verb	Adverb
frugal	No	Yes	No	No
economical	No	Yes	No	No

As adjectives, frugal and economical are synonyms defined as:

Other synonyms of frugal include scotch, sparing, stinting.

frugal (adjective)	economical (adjective)
avoiding waste	of or relating to an economy, the system of production and management of material wealth
	using the minimum of time or resources necessary for effectiveness
	avoiding waste