Substantial

Substantial means, of considerable importance, size or value. It also describes something strongly built or made (in the case of my cakes sometimes both meanings apply!) Another meaning is concerning the substantial points of something.

Substantially either means to a great extent, or for the most part.

To say that the substance of my substantial (100,000 words!) novel, Paint Me a Picture, concerns Mavis's relationships with her family and colleagues is substantially correct.

Logorrhoea

Maybe you've heard, or even used, the phrase 'verbal diarrehoea' for someone who talks too much? Logorrhoea is actually the correct word to use as it means an excessive flow of words. It's prononunced log-oh-ree-a.