own (a) - (n) ownership of own, (v) to own
library (n) - (a) library
comfortable (a) - (n) comfortableness or comfortability
change (v) - (a) change or changeless or changeable, (n) change or changing
possible (a) - (n) possible or possibility
teach (v) - (n) teaching, (a) teachable
expense (n) - (a) expensive
n - noun - сущ.
a - adjective - прилагательное
v - verb - глагол