Observed means to have noticed or perceived something, especially through careful attention and scrutiny.
It can also mean to have seen or witnessed an event or situation. Furthermore, it encompasses the adherence to a rule, law, or custom. The act of observing often involves using one's senses to gather information and form an understanding of the subject at hand.
The context influences the specific nuances of its meaning. It implies a degree of active attention or participation. .
SAW
SEEN EYED SAID
NOTED
BEHELD OBEYED VIEWED
NOTICED SPOTTED WATCHED
LOOKEDON REGARDED REMARKED
DISCOVERED
ASCERTAINED