comfortable vs well-to-do

comfortable and well-to-do both are adjectives.

Word	Noun	Adjective	Verb	Adverb
comfortable	No	Yes	No	No
well-to-do	No	Yes	No	No

As adjectives, comfortable and well-to-do are synonyms defined as:

comfortable and well-to-do: in fortunate circumstances financially; moderately rich

Other synonyms of comfortable include easy, prosperous, well-fixed, well-heeled, well-off, well-situated.

comfortable (adjective)	well-to-do (adjective)
providing or experiencing physical well-being or relief (`comfy' is informal)	in fortunate circumstances financially; moderately rich
free from stress or conducive to mental ease; having or affording peace of mind
in fortunate circumstances financially; moderately rich
sufficient to provide comfort
having a wide margin