observe

[1]	obey , detect , find , abide by , comply with , discover , notice , be heedful of , attend to , conform to , regard , keep , follow , adhere to , respect , pay attention to
[2]	watch , note , mention , look at , examine , remark , monitor , scrutinize , study , regard , view , inspect , pore over , contemplate , consider , (Colloq) check (out/up on) , check over , size up , (Slang) case
[3]	see , note , take note , mark , notice , look , perceive
[4]	observe on/upon , comment (on/upon) , remark (on/upon) , mention , say , note , refer (to) , make reference to , animadvert on/upon/to , state , declare
[5]	celebrate , respect , honor , keep , solemnize , honour , abide by , respect , keep holy , mark , commemorate , memorialize , remember , recognize
[6]	celebrate , keep
[7]	watch , follow , watch over , keep an eye on
[8]	keep , maintain
[9]	keep