Synonyms of the word

preferably

• adv. In preference; by choice; in a preferable manner.

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.

sooner

• adj. comparative form of soon: more soon.
• adv. comparative form of soon: more soon.
• adv. rather.