obstructer vs thwarter

obstructer and thwarter both are nouns.

Word	Noun	Adjective	Verb	Adverb
obstructer	Yes	No	No	No
thwarter	Yes	No	No	No

As nouns, obstructer and thwarter are synonyms defined as:

obstructer and thwarter: someone who systematically obstructs some action that others want to take

Other synonyms of obstructer include obstructionist, obstructor, resister.

obstructer (noun)	thwarter (noun)
any structure that makes progress difficult	someone who systematically obstructs some action that others want to take
someone who systematically obstructs some action that others want to take