verbs
discover or determine the existence, presence, or fact of
"She detected high levels of lead in her drinking water"; "We found traces of lead in the paint"
make mention of
"She observed that his presentation took up too much time"; "They noted that it was a fine day to go sailing"
observe with care or pay close attention to
"Take note of this chemical reaction"
watch attentively
"Please observe the reaction of these two chemicals"
is a type of (narrower)
look attentively
"watch a basketball game"
show respect towards
"honor your parents!"
behave as expected during of holidays or rites
"Keep the commandments"; "celebrate Christmas"; "Observe Yom Kippur"
follow with the eyes or the mind
"Keep an eye on the baby, please!"; "The world is watching Sarajevo"; "She followed the men with the binoculars"
stick to correctly or closely
"The pianist kept time with the metronome"; "keep count"; "I cannot keep track of all my employees"
conform one's action or practice to
"keep appointments"; "she never keeps her promises"; "We kept to the original conditions of the contract"