Three of kind puzzle help plz??

"RD Challenge by Will shortz
Three of a kind. The words below share a single feature. For example, a compass, a phonograph, and a pine tree all have... needles. Each answer is a seven-letter plural ending in S.
1. Thermometer, college graduate, location on a globe.
2.mattress, health resort, year
3. Television, porch, basketball team on offense
4.Greek building, newspaper, marching army
5.River, nose, denture
6. Ion, credit card bill, cavalry
7.Tennis player, noisy party, Mafia ring
8. April, locker room, bride before her wedding
9. Bed, rancher, bookie
10. Crossword puzzle, post office, high school sports star "

i think the last one is "letters" and possibly number 7 is "rackets" but i'm not sure how a "Mafia ring" would fit in... Hmm.. Any help would be very mush appreciated!! :D This is extra credit

1.) degrees
2.)springs
3.)
4.)columns
5.)bridges
6.)
7.)rackets
8.)showers
9.)
10.)letters

Those are the ones I can figure out off the top of my head...will think about the others and post when I've figured them out!

OH, 3 is screens.

And I think 9 must be spreads. And the first answerer figured out #6 (charges) .....so that's all of 'em!

degrees
springs
?
columns
bridges
charges
rackets [like, i wanna get into the bookmaking racket]
showers
?
letters
well, there's some help

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