Common Nouns:
* Beauty: the quality of being beautiful
* Charity: the act of giving money or help to the poor
* Company: a group of people
* Country: a nation
* Duty: a task or obligation
* Energy: power or strength
* Family: a group of people related to each other
* History: the study of past events
* Injury: harm or damage
* Journey: a long trip
* Liberty: freedom
* Memory: the ability to remember things
* Money: a medium of exchange
* Mystery: something that is difficult to understand
* Party: a social gathering
* Policy: a plan of action
* Property: something that is owned
* Quantity: an amount
* Safety: the state of being safe
* Security: the state of being protected
* Society: a group of people living together
* Story: a tale or account
* Strategy: a plan for achieving a goal
* Study: the act of learning
* Summary: a brief overview
* Symphony: a musical composition
* Theory: a set of ideas
* Victory: a win
* Warranty: a guarantee
Less Common Nouns:
* Accessory: an item that adds to or complements something else
* Alchemy: a medieval science
* Apology: an expression of regret
* Bakery: a place where bread is baked
* Biography: a written account of someone's life
* Cacophony: a harsh, discordant mixture of sounds
* Category: a class or group
* Ceremony: a formal act or series of acts performed on a special occasion
* Clergy: the body of ordained ministers in a church
* Controversy: a disagreement or argument
* Democracy: a system of government in which all, or many citizens have the power to influence their own governance
* Desperado: a desperate or reckless outlaw
* Discovery: the act of finding something new
* Empathy: the ability to understand and share the feelings of another
* Factory: a building where goods are manufactured
* Fidelity: faithfulness or loyalty
* Gallery: a room or building where art is displayed
* Geography: the study of the earth's surface
* Glory: great honor or praise
* Harmony: agreement or concord
* History: the study of past events
* Hypothesis: a proposed explanation for a phenomenon
* Industry: the production of goods or services
* Infamy: notoriety for evil deeds
* Inquiry: an investigation
* Intrigue: secret or underhanded plotting
* Inventory: a list of goods in stock
* Legacy: something handed down from an ancestor
* Luxury: great comfort or extravagance
* Melody: a sweet or pleasing succession of notes
* Memory: the ability to remember things
* Monarchy: a system of government in which a king or queen rules
* Mythology: a body of myths
* Navy: a country's fleet of warships
* Obituary: a notice of someone's death
* Opportunity: a chance or possibility
* Parody: a humorous imitation
* Pharmacy: a place where medicines are dispensed
* Philosophy: the study of knowledge and existence
* Poetry: a literary work in verse form
* Psychology: the study of the mind and behavior
* Recovery: the process of regaining health or strength
* Repertory: a stock of plays or other items
* Repository: a place where things are stored
* Scenery: the natural features of a place
* Scripty: a written document, especially one that is not very formal
* Security: the state of being protected
* Sociology: the study of society
* Strategy: a plan for achieving a goal
* Symphony: a musical composition
* Testimony: evidence given in court
* Theory: a set of ideas
* Tragedy: a serious play or event with an unhappy ending
* Victory: a win
* Villainy: wickedness
* Vulnerability: the state of being susceptible to harm
* Warranty: a guarantee
This is not an exhaustive list, and there are many other nouns ending in "y".