Some synonyms for learn: study, grasp, read, apprentice, review, discover, uncover, gather, detect, discern...
Words synonymous to the term "biting" are chomping, itching, and nipping. Other synonymous words include stinging, marking, burning, pinching, and wounding.
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danger
With what? Synonymous means that something has the same meaning, so you have to be more specific. Some slang words mean the same as other words, but some don't.
The phrase "alteration" can be synonymous with changing in Sonnet 116.
pomp, pomposity, splendor
Yes, those words are synonymous.
The words fluid and unstable are synonymous.
Yes, those words are synonymous.
Opposite, reverse...
obedient
Synonyms are words with similar meanings, such as big and large.