thwart vs cross thwart

thwart and cross thwart both are nouns.

Word	Noun	Adjective	Verb	Adverb
thwart	Yes	No	Yes	No
cross thwart	Yes	No	No	No

As nouns, thwart and cross thwart are synonyms defined as:

thwart and cross thwart: a crosspiece spreading the gunnels of a boat; used as a seat in a rowboat

thwart (noun)	cross thwart (noun)
a crosspiece spreading the gunnels of a boat; used as a seat in a rowboat	a crosspiece spreading the gunnels of a boat; used as a seat in a rowboat

thwart (verb)	cross thwart (verb)
hinder or prevent (the efforts, plans, or desires) of