Observe
Part of speech: verb
Definition: To notice or view, especially carefully or with attention to detail. To follow the custom, practice, or rules (especially of a religion.) To comment on something; to make an observation.
Example sentence: I'm never bored, never ever bored. If I've got a day off I'll sit in a cafe and watch and observe. I'm a great observer.
Keep
Part of speech: noun
Definition: Care, notice.The main tower of a castle or fortress, located within the castle walls.The food or money required to keep someone alive and healthy; one's support, maintenance.
Part of speech: verb
Definition: To maintain possession of.To maintain the condition of.To remain in, to be confined to.To wait for, keep watch for.To restrain.To continue.To remain edible or otherwise usable.To remain in a state.To act as wicket-keeper.to raise; to care for.
Example sentence: Life is like riding a bicycle. To keep your balance, you must keep moving.