There are tens of thousands of answers to this question.
large, muave, opaque, clockwise, etc., etc., etc.
The synonym for the word "sordid" is "squalid" or "shameful."
Puzzling A+LS FTW
The term "word" has the synonyms article, designation, phrasing, text, or term.
Credibility
upset, worried, troubled, distracted, tormented, distraught, agitated, wretched
Wretched, miserable, hopeless, pathetic, pitiful are all synonyms for abject
Indifference
A wretched witch kidnapped me when I was 5 years old.
some animals are kept in the most wretched conditions.
"Animal biology" is the closest term.
An informal synonym for the term optimal is the word ace. Ideal is also a good synonym, as well as matchless. There are a lot of other synonyms that can be found in a thesaurus or online.
The term for using one word instead of another but conveying the same meaning is "synonym."