The phrase "one other" can be replaced with several synonyms. "Another" is a commonly used synonym, which implies a second item or person. "Different" can also be used when referring to distinct individuals or things, such as in the phrase "two different people." "Additional" indicates another item added to a group, as in "one additional person." "Alternately" implies a different option or choice, such as in the phrase "one can do this or alternately do that." Other synonyms for "one other" include "second," "alternate," and "extra." Each of these words conveys the idea of something additional or different from the initial subject or option.