"Wert a guest" is an old English phrase meaning "were a guest". It can be replaced with various synonyms such as "were invited", "were welcomed", "were hosted", or "were entertained". These synonyms help to convey the same meaning in a more modern way. For instance, instead of saying "wert a guest at the party", one can say "were entertained at the celebration". Additionally, other synonyms that can be used include "were received", "were attended to", and "were accommodated". Simply put, these synonyms can help to improve the clarity and depth of one's language by providing more options to describe similar situations.