submitted item; document to submit; assignment
Refers to any item that is to be submitted or has been submitted, such as homework, reports, or official documents. Commonly used in school and office contexts.
Please submit your assignments by tomorrow.
The deadline for submissions is next Friday.
課題 is a task or assignment, often used in academic settings, while 提出物 is the actual submission resulting from that task.
Compound of 提出 (ていしゅつ, 'submission') + 物 (ぶつ, 'thing'). The reading ぶつ is the standard on'yomi for 物 in compound nouns.