There are a total of 26 8-letter words containing 'vac', and the number may vary in different dictionaries. You can specify the dictionary and order.

• casevacs ₁₈
• evacuant ₁₇
• evacuate ₁₆
• evacuees ₁₆
• medevacs ₁₉
• medivacs ₁₉
• vacantia ₁₆
• vacantly ₁₉
• vacating ₁₈
• vacation ₁₆
• vaccinal ₂₀
• vaccinas ₁₉
• vaccinee ₁₉
• vaccines ₁₉
• vaccinia ₁₉
• vacuolar ₁₇
• vacuoles ₁₇
• vacuumed ₂₁
• vivacity ₂₁
• autovacs ₁₃
• vacances ₁₅
• vacaturs ₁₃
• vacherin ₁₆
• vacuated ₁₄
• vacuates ₁₃
• vacuists ₁₃

There are 26 8-letter words containing vac in the well-known word game dictionary, 17 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 24 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 19 in the Words with Friends (WWF) dictionary.