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This research aims to investigate several aspects of semantic knowledge and naming ability related to the verb production in dementia of Alzheimer Type(hereafter, DAT) patients and normal children. In this study, the semantic approximation as well as cognitive flexibility concerning [SEPARATION] verbs in two groups were studied in 12 DAT patients, compared with 12 normal children during an action naming task based on video-clips, an experimental design called APPROX(Duvignau et al., 2007). Concerning the related works of the language disorder in DAT as well as ‘metaphor- like-utterance’ in normal children, the majority of studies have focused on nominal production. Little is known about action semantics and verb production. The responses produced by patients and children were analyzed focused on the four distinctions: ① validity, ② specificity, ③ expectancy and ④ approximation. Our findings suggest that DAT patients have a progressive loss of the more conventional lexical items(‘bottom-up breakdown’) and normal children tend to use the related and approximative responses regarding the target-action.