As adverbs the difference between significantly and effectively
is that significantly is in a significant manner or to a significant extent while effectively is in an efficient or effective manner; with powerful effect.
As adverbs the difference between immediately and effectively
is that immediately is in an immediate manner; instantly or without delay while effectively is in an efficient or effective manner; with powerful effect.
As a conjunction immediately
is Indicates that the dependent clause describes something that occurs immediately after the independent clause's referent does.
As adverbs the difference between effectively and practically
is that effectively is in an efficient or effective manner; with powerful effect while practically is in practice; in effect. Not necessarily officially the case but what actually occurs.