1. Matching words include Abbassides, Abbethdins, Abbevilean, Abbeystead, abbotships, Abbottabad and abbreviate

2. Aardvarks aasvogels abactinal abamperes abandoned abandonee abandoner abasement abashedly aBashless abashment abatement abattises abattoirs abbotcies abbotship abcoulomb abdicable abdicated abdicates abdicator abdominal abductees abducting abduction abductors abelmosks abernethy aberrance aberrancy aberrants …

3. Some 10 letter words starting with A are abacterial abalienate,abandonees abandoners,abandoning abasements,abashments Abastumani,abatements AbbassidesAbbethdins Abbevilean,Abbeystead abbotships,Abbottabad abbreviate,abcoulombs abdicating,abdication abdicative,abdicators abdominals,abdominous abducentes