Worry
Part of speech: noun
Definition: A strong feeling of anxiety. An instance or cause of such a feeling.
Part of speech: verb
Definition: To seize or shake by the throat, especially of a dog or wolf. To harass; to irritate or distress. Disturb the peace of mind of; afflict with mental agitation or distress. To be troubled, to give way to mental anxiety. To strangle.
Example sentence: I just stay in my own lane and not worry about what anyone else is doing and settling my own pace.
Headache
Part of speech: noun
Definition: A pain or ache in the head.(figurative) A nuisance or unpleasant problem.
Example sentence: The atmosphere is great for people - it allows us to survive - but it's a real headache for astronomers.