I just checked the copy of Websters Revised Unabridged Dictionary (1913) I loaded into a free app from the URL included in the article. "Condole", "condoled", "condolement", "condolence", "condoler", "condoling", "constrain", "constrainable", "constrained", "constrainedly", "constrainer", "constraining", "constraint", and "constraintive" are all present when searching for the root of both of those words. You can also search here:

https://www.websters1913.com/words/Condolence

https://www.websters1913.com/words/Constraint