Question

Many online dictionaries provide links of features not found in printed dictionaries, such as

Answer 1

A. the etymology of words.
B. different translations of words.
C. the correct pronunciation of words.
D. comparative and superlative forms of words.

Answer 2

Synonyms and antonyms
Dictionaries for specialities, e.g. Medicine, may hyperlink to other conditions mentioned in the definition
Also up to date example sentences sorted by category! <- I've only seen this feature in vocabulary.com but it's awesome