Sorry Doc, Happy April Fools Day anyway. smile

INTERREGNMUM - interregnum between the death of the king and his oldest son obtaining his majority that is usually ruled haphazardly by the son's mum.

(1) add a letter

ENTERREGNUM - hail the new King

(2) change a letter

INTERREGNU - to renew the inner gnu

(3) subtract a letter

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BASHILIC (adj) - what Tyson was