The term 'Fill with Air' can be solved by three different crossword solutions: INFLATE (7 letters), AERATE (6 letters), and PUMPUP (6 letters). INFLATE is a verb meaning to fill something with air or gas, usually using a pump. AERATE is also a verb meaning to fill with air, but it is usually used in reference to soil or water. PUMPUP is a verb meaning to fill something with air or gas, usually using a pump. All three terms refer to the act of filling something with air or gas.