Antonyms for the phrase "plays part" could include words like "negates," "undermines," "disregards," or "ignores." These all suggest a lack of involvement or importance, rather than active participation. Other antonyms might include "detracts," "hinders," "opposes," or "suppresses." These words suggest a hindrance or obstacle to the successful execution of an action or role. Ultimately, the antonyms for "plays part" are words that suggest a lack of engagement, commitment, or relevance to a specific task or goal. In contrast, words like "embraces," "commits," "dedicates," or "supports" would be synonyms for "plays part," suggesting a willingness and enthusiasm for participating fully in a task or role.