The term "bone-contention" refers to a situation where two or more parties are arguing or disagreeing strongly about something. There are various synonyms for this term, including dispute, conflict, disagreement, discord, strife, contention, and wrangling. The word "dispute" indicates a formal or informal argument between two parties, while "conflict" refers to a serious disagreement that may result in physical or emotional confrontations. "Discord" suggests a lack of harmony or agreement, like a discordant note in a musical piece. "Strife" implies a strong, prolonged and often bitter discord or rivalry. "Contention" and "wrangling" denote a more persistent or aggressive argument. All of these words indicate a disagreement that can be difficult to resolve.