Thermometer
Hot
Temperature
Weather
You asked the question wrong. The analogy was : Thermometer is to Temperature as Barometer is to Air Pressure.A meteorologist uses his Barometer to measure pressure in millibars, very small changes in the atmosphere's pressure. He uses the Thermometer to measure the air Temperature.
outbreak
air
Sinkhole is to ground as thunderstorm is to sky.
Dragon (made of Carbon & hydrogen) breathes in oxygen (O2)--> Breathes out fire, CO2 + H20
Americs
bat
The best word to complete the analogy Pachyderm is to Elephant as Crocodilian is to crocodile.
Quran
emotion
champion
donor : organ
Reproach : praise completes the analogy.
Warp
Pounds
is to Army.
Since cotton is a natural fabric, any synthetic fabric (nylon, polyester) will complete your analogy.