11 letter words
YTTRIFEROUS​17
10 letter words
YTHUNDERED​18
YTTERBITES​15
YTTERBIUMS​17
9 letter words (4 words)
YTTERBIUM​16
YTTERBIAS​14
YTTERBITE​14
YTTERBOUS​14
8 letter words (4 words)
YTTERBIA​13
YTTERBIC​15
YTTRIOUS​11
YTTRIUMS​13
7 letter words
YTTRIUM​12
YTTRIAS​10
6 letter words
YTTRIA​9
YTTRIC​11
5 letter words
YTOST​8