Clear this solution

Again
Agin
Angst
Anta
Anti
Asia
Asian
Gain
Gains
Gait
Gast
Giant
Gist
Gnat
Isnt
Nasa
Saga
Saiga
Sain
Saint
Satan
Satang
Satin
Sign
Sing
Snag
Stag
Stain
Sting
Taiga
Tang
Tans