Although-Whereas | Commonly Confused Words

Although

/ɔːlˈðəʊ/

Used to introduce a statement that makes the main statement seem surprising or unlikely

Although I write boldly I am a shy man.And although Gabel inquired:Although Nicholas was happy, too, he was worried about Smike.

This word has no antonyms

/weərˈæz/

Used to introduce a contrast between two facts or statements

Whereas Fifi and Joanna were absolutely right.Whereas Clyde was more soft and vague and fumbling.Whereas we know better.

This word has no antonyms

Although and whereas both create contrasts or comparisons, but they function differently in sentences.
Although typically introduces a subordinate clause and implies that there is a particular outcome or fact that follows despite the information given.
Whereas joins two clauses showing a direct contrast between two things, often used to discuss how two aspects differ.
If you are comparing two things directly, whereas is often more suitable.
Remember that although doesn't directly compare but rather sets up a situation and its unexpected outcome.