Synonyms of the word

instead

• adv. In the place of something (usually mentioned earlier); as a substitute or alternative.

alternatively

• adv. in an alternative way.
• adv. (conjunctive) Used to link a pair of possibilities.

rather

• adv. (obsolete) More quickly; sooner, earlier.
• adv. Used to specify a choice or preference; preferably. (Now usually followed by than).
• adv. (conjunctive) Used to introduce a contradiction; on the contrary.
• adv. (conjunctive) Introducing a qualification or clarification; more precisely. (Now usually preceded by or…
• adv. (degree) Somewhat, fairly.
• v. (nonstandard or dialectal) To prefer; to prefer to.
• adj. (obsolete) Prior; earlier; former.
• interj. (England, dated) An enthusiastic affirmation.