exertion (n.)

• action
• activity
• appliance
• application
• assiduity
• assiduousness
• consumption
• determination
• diligence
• drive
• effort
• employ
• employment
• endeavor
• exercise
• exercising
• industry
• misuse
• operation
• pains
• push
• resolution
• sedulity
• sedulousness
• strain
• striving
• struggle
• toil
• trouble
• usage
• use
• while
• work