These 4-letter soft feathers are used to stuff pillows
Down
In the Kalmar War of 1611-1613, Denmark beat up on this rival to the north
Sweden
Classes at Columbia University's school of this include sports reporting & magazine writing
Journalism
It's where the sub-zero goes
Kitchen
Hyderabad, India is known as the "City of" these marine gemstones
Pearls
Used in lotions, lanolin generally comes from the body grease of these shearable creatures
Sheep
In England Lord Hardwicke's Act of 1753 banned this informal type of marriage without civil or religious ceremony
Common Law
Term for the ideas, theories and methods named for the man seen here

Marxism
Indoor games like 20 Questions are named for it
Parlor
Moscow has been called "The Forty Forties" referring to the estimated 1,600 of these, many with golden domes
Churches
Seth Boyden never got a patent for the process to manufacture the "patent" type of this
Leather
German King Henry VII invaded Rome in 1312 & while he was there, picked up this title
Holy Roman Emperor
Britannica says this "both reached its peak & began its decline" during a series of televised hearings in 1954
McCarthyism
West Wing crisis center since 1961
Situation Room
The resilient Porto, Portugal is called the "Cidade Invicta", or this city
Invisible City
This alliterative type of bristle used in brushes comes from a wild pig relative
Boar Bristle
Meaning "hammer", it was the byname of Frankish king Charles, who hammered a Muslim army at the 732 Battle of Tours
Martel
From a Greek word for "pleasure", it's the belief that pleasure is the highest good
Hedonism
Highlights for children has been called "that ubiquitous magazine" there
Waiting Room
As heard at the start of the song "Molly Malone", "Fair City" is a nickname for this world capital
Dublin
The red pigment carmine comes from cochineal, this type of animal
Beetle / Insects
Helped by Lord Byron, in 1830 it became the first of the Ottoman Empire's subject nations to achieve independence
Greece
In New York City the Gray Panthers organization's mission statement is "activism and advocacy against" this
Ageism
A sleeveless garment + 2 letters; it's where clergy dress
Vestry
The nickname "The Tiger City" for this 4-letter capital may date back to a poem by Bjørnstjerne Bjørnson
Oslo