触摸 (chùmō) is a formal, neutral verb meaning 'to touch', often used in written or technical contexts (e.g., touchscreens). Among similar words, 碰 (pèng) implies light contact or bumping; 接触 (jiēchù) emphasizes physical or social contact; 摸 (mō) is more colloquial and involves probing with the hand; 抚摸 (fǔmō) means gentle stroking; 触动 (chùdòng) can mean physical touching or emotional stirring.