• thompon,
• thomos,
• homeson,
• themon,
• tomason,
• tomson,
• thomspon,
• thousan,
• thison,
• thomspn,
• thomerson,
• thomspons,
• thopmson,
• thomoson,
• thousen,
• thosen,
• thonpson,
• hamson,
• thosan,
• thomkin

• thymosin,
• TOMSON,
• thomism,
• thomasson,
• Thomason,
• Thomasine,
• Thomasena,
• thomsen,
• Thomasina,
• theme song.

The plural form of the word "thomson" is "thomsons".

The singular form of the word "Thomson" is "Thomson". The word "Thomson" is already in singular form and does not change when referring to a single person or thing.