見澄ます[misumasu] to observe carefully
耳を澄ます[mimiwosumasu] to listen carefully
上澄[uwazumi] the clear top of a liquid
澄まし屋[sumashiya] a prim person
澄まし顔[sumashigao] composed expression

澄ます[sumasu] to clear
澄みきる[sumikiru] to be serene
澄み渡る[sumiwataru] to be perfectly clear
澄む[sumu] to clear (e.g. weather)
清澄[seichou] clear

空巣狙い[akisunerai] prowler
狙い[nerai] aim
狙い撃ち[neraiuchi] sharpshooting
狙い所[neraidokoro] target
狙い澄ます[neraisumasu] to take careful aim

狙う[nerau] to aim at
狙撃[sogeki] shooting
狙撃兵[sogekihei] sniper
附け狙う[tsukenerau] to prowl after
穴狙い[ananerai] aiming for a lucky break (e.g. in horse racing, betting on an unlikely horse)