nostril

"The school located the lost backpack in the main office. "

"space travel"

"the orifice of an artery or vein;   the orifice of a wound;   the vagina and other orifices"

"The dog was chasing a twitch in the backyard. "

"My brother is a different person; he's an other, not like me at all. "

"She struggled to play the difficult passages."

"My sister made popcorn for our family movie night. "

"Often the anticipation of a shot is worse than the pain of the stick."

"My parents didn't want me to go to the party, and neither did my friends. "

"A lot of gas had escaped from the cylinder."

"She struggled to play the difficult passages."

"The doctor prescribed a nasal to help clear my stuffy nose before the school play. "