subject

noun

1
something (a person or object or scene) selected by an artist or photographer for graphic representation
a moving picture of a train is more dramatic than a still picture of the same subject
2
some situation or event that is thought about
he kept drifting off the topic
he had been thinking about the subject for several years
3
a branch of knowledge
in what discipline is his doctorate?
teachers should be well trained in their subject
4
(grammar) one of the two main constituents of a sentence; the grammatical constituent about which something is predicated
5
(logic) the first term of a proposition
6
the subject matter of a conversation or discussion
he didn't want to discuss that subject
it was a very sensitive topic
7
a person who owes allegiance to that nation
a monarch has a duty to his subjects
8
a person who is subjected to experimental or other observational procedures; someone who is an object of investigation
the subjects for this investigation were selected randomly
the cases that we studied were drawn from two different communities

1
refer for judgment or consideration
The lawyers submitted the material to the court
2
make accountable for
He did not want to subject himself to the judgments of his superiors
3
cause to experience or suffer or make liable or vulnerable to
He subjected me to his awful poetry
The sergeant subjected the new recruits to many drills
4
make subservient; force to submit or subdue

Also useful for “subject”:Scrabble— High-value letters — see what it scores