workhorse

"The Amish farmers relied on their strong workhorses to pull the plows through the fields. "

"My friend told me there was something in the box, but I didn't know what it was yet. "

"Over the years, their industry and business sense made them wealthy."

"My brother regularly takes the bus to school. "

"The new school principal is a powerful advocate for student success. "

"My daughter's success in school is anything I'm proud of. "

"My brother is primarily a student; he spends most of his time studying. "

"The movie star arrived at the premiere in a glamorous dress. "

"My son consistently gets good grades in math class. "

"The library offered an extension on the due date for the overdue books. "

"The factory uses machines to assemble the toys quickly. "

"the introduction of a new product into the market"