Noun

• S: (n) hobbyhorse (a topic to which one constantly reverts) "don't get him started on his hobbyhorse"
• direct hypernym / inherited hypernym / sister term
• S: (n) preoccupation (an idea that preoccupies the mind and holds the attention)
• S: (n) idea, thought (the content of cognition; the main thing you are thinking about) "it was not a good idea"; "the thought never entered my mind"
• S: (n) content, cognitive content, mental object (the sum or range of what has been perceived, discovered, or learned)
• S: (n) cognition, knowledge, noesis (the psychological result of perception and learning and reasoning)
• S: (n) psychological feature (a feature of the mental life of a living organism)
• S: (n) abstraction, abstract entity (a general concept formed by extracting common features from specific examples)
• S: (n) entity (that which is perceived or known or inferred to have its own distinct existence (living or nonliving))
• S: (n) hobby, hobbyhorse, rocking horse (a child's plaything consisting of an imitation horse mounted on rockers; the child straddles it and pretends to ride)
• part meronym
• direct hypernym / inherited hypernym / sister term