Trouble
Part of speech: noun
Definition: A distressful or dangerous situation. A difficulty contributing to such a situation Efforts taken. A malfunction, as in "heart trouble". A violent occurrence.
Part of speech: verb
Definition: To bother; to annoy.
Example sentence: Friends show their love in times of trouble, not in happiness.
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: Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.