emotion
The word that will complete the analogy is "reveal." All the words in the analogy are synonyms for sharing information or making something known.
Americs
The word pair that would best complete the analogy is DECEPTION GUILE.
bat
The best word to complete the analogy Pachyderm is to Elephant as Crocodilian is to crocodile.
champion
Quran
donor : organ
Reproach : praise completes the analogy.
Pounds
is to Army.
Since cotton is a natural fabric, any synthetic fabric (nylon, polyester) will complete your analogy.