Which word in each series is the odd one out, and why? You may find different answers from mine for perfectly good reasons. Some are straightforward, others a little sneaky and some a bit fiendish.

-1. phlegm, cribbage, delivery, penchant, hearing
-2. sale, crew, present, time, love
-3. bonnet, gangster, cover, scrap
-4. lion, wolf, goat, bull
-5. O, H, E, C, N
-6. Greece, France, Austria, China, Nigeria
-7. issue, evolve, age, out, egress
-8. route, write, squire, troupe, towed
-9. green, yellow, orange, purple, pink
-10. sapphire, diamond, ruby, topaz, emerald

5. E - not in the periodic table of elements

Yes!

3. scrap - not considered a "hood"

1. I am sure it is something else but cribbage is the only one that is a card game

6. Nigeria, the only one in Africa or Greece, the only one without the letter a.

9. Pink is not a color in the rainbow

10. diamond - only single element

michele

For the rest, try again.

1. penchant - the others all contain body parts (leg, rib, liver, ear)

9. yellow - all the other colors are made by combining colors - yellow is yellow

Yes to both!

4. wolf - all others represent astrological signs

Good one!

8. squire-the others have homophones

6. Austria, the only one beginning with a vowel, and/or having the same letter at both ends

manxman

Lex, try again. The answer has nothing to do with the letters of the names.

6. Nigeria, as the only country on the list not at some point occupied by Axis forces during WW2.

7. Issue - all the others become new words if r is added as a first letter.

10. diamond - It's pure carbon while the others contain some form of aluminun.

10. Topaz - it's the only one that not an anniversary stone

10. topaz - only gem that's semi-precious

2. crew - the others anagram into names of living things

Demosthenes, I can't argue with that. My answer was France because its flag is three colored while the others have two colors.

Lex and Sherlock

All three answers for #10 work. Michele had my answer.