pinyin: mǎ

Chinese phrase: 马 mǎ - horse
马上 mǎ shàng - immediately, at once

Examples:
吗
pinyin: ma, - used at the end of a sentence to indicate doubt.
Chinese phrase: 你明白了吗? nǐ míng bái le ma? - Do you understand?

骂
pinyin: mà; - verbally abuse
Chinese phrase: 骂人 mà rén - to swear at people

妈
pinyin: lùn;
Chinese phrase: 妈妈 mā ma - mom, mother
姨妈 yí mā - untie, sister of one's mother