Nudge (verb)
Synonyms: touch, bump (against), push (against), run into
Antonyms: discourage, pull, repress
Explicitly (Adverb)
Synonyms: specially, decidedly, surprisingly
Antonyms: normally, usually, commonly
Supersede (Verb)
Synonyms: replace, supplant, displace, oust, overthrow
Antonyms: keep, stay, accept.
Turbulence (Noun)
Synonym: Upheaval, turbulences
Antonym: Peace, Serenity, Quenching