Formal Stems:
* Implor-: This is the most basic stem and can be used in many contexts. Examples: imploration, imploringly
* Plor-: This is a less common stem, but can be used in certain contexts. Examples: implorer, implorable
Informal Stems:
* Beg-: This is a more common informal synonym for implore. Examples: beggar, begging
* Plead-: This emphasizes the pleading aspect of imploring. Examples: pleader, pleading
Other Options:
* Entreat-: This stem emphasizes the urgency of the request. Examples: entreaty, entreating
* Supplic-: This stem highlights the humility of the request. Examples: supplication, suppliant
The best stem to use will depend on the specific context and the desired tone of your writing.