Obstacle rhymes with:
aeronautical, article, bespectacle, cortical, cuticle, diacritical, grammatical, hypothetical, impractical, nautical, particle, political, practical, receptacle, skeptical, spectacle, tentacle
aeronautical, article, bespectacle, cortical, cuticle, diacritical, grammatical, hypothetical, impractical, nautical, particle, political, practical, receptacle, skeptical, spectacle, tentacle