effective vs effectual

effective and effectual both are adjectives.

Word	Noun	Adjective	Verb	Adverb
effective	No	Yes	No	No
effectual	No	Yes	No	No

As adjectives, effective and effectual are synonyms defined as:

effective and effectual: producing or capable of producing an intended result or having a striking effect

Other synonyms of effective include efficacious.

effective (adjective)	effectual (adjective)
producing or capable of producing an intended result or having a striking effect	producing or capable of producing an intended result or having a striking effect
existing in fact; not theoretical; real	having legal efficacy or force
able to accomplish a purpose; functioning effectively
works well as a means or remedy
ready for service
exerting force or influence