economical vs frugal

economical and frugal both are adjectives.

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

As adjectives, economical and frugal are synonyms defined as:

Other synonyms of economical include scotch, sparing, stinting.

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