The word 'coward' can be substituted with various synonyms, each carrying its own nuances. Here are a few synonyms for 'under coward': pusillanimous, timorous, craven, spineless, lily-livered, yellow-bellied, faint-hearted, and chicken-hearted. Each of these words describes a lack of courage or bravery, but also carries a slightly different connotation. For example, 'pusillanimous' suggests a lack of determination or firmness, while 'craven' implies a lack of integrity or character. 'Yellow-bellied' and 'chicken-hearted' both reference the physical manifestation of fear, while 'timorous' and 'spineless' might be used to describe someone who is easily intimidated or submissive.