7 letter words
GENUINE​8
INGENUE​8
6 letter words
ENGINE​7
INGENU​7
5 letter words
GENIE​6
ENNUI​5
EIGNE​6
4 letter words (8 words)
GENE​5
NINE​4
EINE​4
NENE​4
GINN​5
GIEN​5
GENU​5
EUGE​5
3 letter words (18 words)
INN​3
GNU​4
GUN​4
ING​4
ENG​4
GEN​4
UNI​3
EEN​3
GEE​4
GIN​4
NIE​3
NEG​4
NUN​3
NEE​3
ENE​3
GUE​4
GIE​4
NUG​4
2 letter words (9 words)
IN​2
EN​2
UN​2
NE​2
EE​2
GI​3
NU​2
UG​3
GU​3