reptile n. 爬行动物
surreptitious a. 鬼鬼祟祟的(sur下面+rept+itious→在下面爬的→鬼鬼祟祟)
subreption n. 隐瞒真相(sub在下面+reept+ion→[真相]爬在下面→隐瞒真相)