There are numerous synonyms for the phrase "are acceptable." These include "are permissible," "are tolerable," "are admissible," "are suitable," "are suitable for," "are appropriate," and "are adequate." Each of these synonyms has a slightly different connotation and may be used in different contexts. For example, "are permissible" may be used in a legal or policy context, while "are suitable" may be used in a more general sense. Using synonyms can add variety and nuance to written or spoken language and can help to avoid repetition.