Subplot and Subordinate

noun

• An assistant subject to the authority or control of another.
  • synonyms: subsidiary, underling, foot soldier
• A word that is more specific than a given word.
  • synonyms: hyponym, subordinate word

verb

• Rank or order as less important or consider of less value.
  • usage: "Art is sometimes subordinated to Science in these schools"
• Make subordinate, dependent, or subservient.
  • usage: "Our wishes have to be subordinated to that of our ruler"
  • synonyms: subdue

adjective

• Lower in rank or importance.
  • synonyms: low-level
• Subject or submissive to authority or the control of another.
  • usage: "a subordinate kingdom"
• Of a clause. ( unable to stand alone syntactically as a complete sentence)
  • usage: "a subordinate (or dependent) clause functions as a noun or adjective or adverb within a sentence"
  • synonyms: dependent

• (n.) One who stands in order or rank below another; -- distinguished from a principal.
• (a.) Inferior in order, nature, dignity, power, importance or the like.
• (v.t.) To place in a lower order or class; to make or consider as of less value or importance; as, to subordinate one creature to another.
• (v.t.) To make subject; to subject or subdue; as, to subordinate the passions to reason.
• (a.) Placed in a lower order, class or rank; holding a lower or inferior position.

To make subject or junior to.