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Synonyms for Subject (same or very similar meaning)

WordNet sense 1 (a person who is subjected to experimental or other observational procedures; someone who is an object of investigation):
case, case, guinea pig

WordNet sense 2 (a person who owes allegiance to that nation):
national

WordNet sense 3 (the subject matter of a conversation or discussion):
theme, topic

WordNet sense 4 (a branch of knowledge):
bailiwick, discipline, field, study, branch of knowledge, field of study, subject area, subject field

WordNet sense 5 (some situation or event that is thought about):
issue, matter

WordNet sense 6 (something (a person or object or scene) selected by an artist or photographer for graphic representation):
content, content, depicted object

WordNet sense 7 ((of goods or funds) subject to taxation):
nonexempt, taxable

WordNet sense 8 (make subservient; force to submit or subdue):
subjugate

WordNet sense 9 (possibly accepting or permitting):
capable, open

WordNet sense 10 ((often followed by `of' or `to') yielding readily to or capable of):
susceptible

WordNet sense 11 (being under the power or sovereignty of another or others):
dependent

WordNet sense 12 (subject or submissive to authority or the control of another):
subordinate

WordNet sense 13 (refer for judgment or consideration):
submit

WordNet sense 14 (acted upon; influenced):
affected


From the ODE community, based on WordNetadd/edit