Nosedive –
As noun – Drop / Plunge
Nose – dive –
As verb – Plunge / Decline
Antonym- Rise / Climb
Abstain – Cease / Refrain / Withhold/ Forbear
Antonym – Continue / Embrace
It is a verb.
Abstinence – Chastity / Self – restraint / Avoidance / Shuffle
Antonym – Indulgence / Intoxication
It is a noun.
Arsenal – armoury / Factory / Magazine / Helper / Aider / Equipment
Antonym – Debt
It is a noun.
Propagation – Extension / Stretch / Reach / Tension / Reproduce / Multiply
Antonym – Conceal / Hide
It is a noun.
Vermin – Hound
It is a noun.
Demeanour – Behaviour / Attitude
It is a noun.
Splurge – Endeavour / Persevere
It is a noun.
Breadwinner – A man / woman who earns money to support his / her family
It is a noun.
Exponent – Index / Example / Illustration / Interpreter
Antonym – Antagonist / Opponent
It is a noun.
Relics – Debris / Ruins / Remains / Memorabilia / Vestiges
It is a noun.
Breakneck – Rapid / Galloping / Dangerous / Risky
Antonym – Safe / Slow
It is an adjective.
Heinous -Shocking / Damned / Horrific / Disgusting / Abominable
Antonym – Desirable / Acceptable
It is an adjective.
Defame – Condemn / Slander / Denounce / Blame / Calumniate
It is a verb.
Rigorous – Accurate / Burdensome / Strict / Tough
Antonym – Careless / Imprecise
It is an adjective.