• zcer rubrum,
• scer rubrum,
• wcer rubrum,
• qcer rubrum,
• axer rubrum,
• aver rubrum,
• afer rubrum,
• ader rubrum,
• acwr rubrum,
• acsr rubrum,
• acdr rubrum,
• acrr rubrum,
• ac4r rubrum,
• ac3r rubrum,
• acee rubrum,
• aced rubrum,
• acef rubrum,
• acet rubrum,
• ace5 rubrum,
• ace4 rubrum

The adjective form of "Acer Rubrum" is "acer rubrum," as the name is already in Latin and it functions as both the scientific name and the common name for the red maple tree.

The plural form of "Acer Rubrum" is "Acer Rubra".

The singular form of the word "Acer Rubrum" is "Acer Rubrum". It is the scientific name or binomial name of the red maple tree and does not change when referring to a single tree.