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)
• direct hyponym / full hyponym
• S: (n) obsession, fixation (an unhealthy and compulsive preoccupation with something or someone)
• S: (n) hang-up (an emotional preoccupation)
• S: (n) hobbyhorse (a topic to which one constantly reverts) "don't get him started on his hobbyhorse"
• S: (n) self-absorption (preoccupation with yourself to the exclusion of everything else)
• S: (n) omphaloskepsis, navel-gazing (literally, the contemplation of one's navel, which is an idiom usually meaning complacent self-absorption)
• direct hypernym / inherited hypernym / sister term
• 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"
• derivationally related form
• W: (v) preoccupy [Related to: preoccupation] (engage or engross the interest or attention of beforehand or occupy urgently or obsessively) "His work preoccupies him"; "The matter preoccupies her completely--she cannot think of anything else"
• 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)