Some words that can be read properly both with a mirror and without a mirror are MOM, WOW, T.I.T, TAT, TOOT (see full details here brainly.ph/question/243662)
Other examples:
1. HUH
2. YAY
3. TOT
4. TAT
5. HAH
(see 5 more examples here https://brainly.ph/question/248143)