A really fast thesaurus... with lots of synonyms.
Other words for said include stated, remarked, replied, asked, whispered, exclaimed, and muttered — pick the one that matches the tone of what was spoken.
Match the verb to the tone: use stated, remarked, or noted for neutral speech; asked or inquired for a question; exclaimed, shouted, or snapped for emotion; and whispered or murmured for something quiet.
No. "Said" is nearly invisible to readers and works well most of the time. Reach for a stronger verb only when the tone or volume genuinely adds something the dialogue itself does not.