Synonyms for Either:
both, dual, matching, two, coupled.
n.by the way, not to mention, incidentally, anyway, the fact that, in any case, anyhow, namely, even so. unbelievable, whether or not, it might be that, ultimate, it could be that, Unless, one or the other, couldn't be better/worse/nicer etc., of your life, with/without distinction, unadulterated, conspicuous, not...anything better/worse, like nothing on earth. •on the one hand (noun)
Unless, it could be that, it might be that, one or the other, whether or not.