The word "in background" refers to something that exists or operates in the background, waiting to be noticed or acknowledged. Synonyms for this term include "subdued," which describes something that is hushed or kept lower in volume, "behind the scenes," which means something is done without being seen or noticed, and "subtle," which refers to something that is not easily recognizable or noticeable. Other synonyms for "in background" include "faint," "understated," "unobtrusive," and "hidden," all of which indicate something that is present but not immediately visible or perceived.