15. pear=par 生
appear
appearance
disappear
disappearance
disappeared
reappear
reappearance
parent
parental
biparental
non-parental
parentage
parenting
parenthood
parent-adolescent
parent-child
stepparent
grandparent
great-grandparent
godparent
one-parent
two-parent
single-parent
heir-apparent
apparent
apparently
apparition
transparent
transparently
transparentize
transparence
transparency
semi-transparent
primipara
primiparity
primiparous
biparous
multiparous
fissiparous