looker vs observer

looker and observer both are nouns.

Word	Noun	Adjective	Verb	Adverb
looker	Yes	No	No	No
observer	Yes	No	No	No

As nouns, observer is a hypernym of looker; that is, observer is a word with a broader meaning than looker:

looker: a close observer; someone who looks at something (such as an exhibition of some kind)
observer: a person who becomes aware (of things or events) through the senses

Other hypernyms of looker include beholder, perceiver, percipient.

looker (noun)	observer (noun)
a very attractive or seductive looking woman	a person who becomes aware (of things or events) through the senses
a close observer; someone who looks at something (such as an exhibition of some kind)	an expert who observes and comments on something