This was the word that first caught my eye as the obverse of onomatopoeia.
( This ( ( was ( ( the word ) ( that ( first ( ( caught ( my eye ) ) ( as ( ( the obverse ) ( of onomatopoeia ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBD was) (NP (NP (DT the) (NN word)) (SBAR (WHNP (WDT that)) (S (ADVP (RB first)) (VP (VBD caught) (NP (PRP$ my) (NN eye)) (PP (IN as) (NP (NP (DT the) (NN obverse)) (PP (IN of) (NP (NN onomatopoeia)))))))))) (. .)))
I had no interest in any words that were the obverse of onomatopoeia. 
( I ( ( had ( ( no interest ) ( in ( ( any words ) ( that ( were ( ( the obverse ) ( of onomatopoeia ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD had) (NP (NP (DT no) (NN interest)) (PP (IN in) (NP (NP (DT any) (NNS words)) (SBAR (WHNP (WDT that)) (S (VP (VBD were) (NP (NP (DT the) (NN obverse)) (PP (IN of) (NP (NN onomatopoeia))))))))))) (. .)))