1. A whim 
2. A whimsical thing; an odd device; a trifle; a trinket

Derived forms: whim-whams

• though
• thought
• thought experiment
• thought process
• thought transference
• thought-image
• thought-provoking
• thought-reader
• thoughtful
• thoughtfully
• thoughtfulness
• thoughtless
• thoughtlessly
• thoughtlessness
• thousand
• Thousand and One Nights
• Thousand Island dressing
• thousand times
• thousand-fold
• thousandth
• Thrace
• Thracian
• Thraco-Phrygian
• thraldom
• thrall