As you are offline I will try to answer your question as best I can with the information I have available.
Alzheimer disease is a neurodegenerative process which causes loss of brain volume and progressive loss of functions. The earliest symptoms usually are short term memory loss, misplacing items, forgetting to pay bills, forgetting appointments and forgetting names. occasionally word-finding difficulties may present early on, but are more typical when the disease progresses. Alzheimer's disease is more common as age increases but not typically beginning before the age of 65
What you are describing are unintentional word-substitutions and can be a result of a multitude of different processes - one of which is attention and concentration. If you are not focused on the discussion, not well rested, stressed etc. you may unintentionally say a word that you did not mean. Word-substitutions alone do not indicate Alzheimer's disease. If you feel as though the symptoms are worsening or you are experiencing memory loss as well I recommend you see a neurologist for an in-office memory test as a screen such as a MOCA or MMSE.
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Thank you and Best Regards,
Janne Nissinen, MD