The word "knight" is derived from the Old English word "cniht", which was pronounced with a "k" sound. The spelling "knyght" reflects this pronunciation.

The word "dumb" is derived from the Old English word "dumba", which was pronounced with a "d" sound. The spelling "dumb" does not reflect this pronunciation.

The word "psychology" is derived from the Greek words "psyche", meaning "soul", and "logos", meaning "study". The spelling "psychology" reflects these roots.

The word "mathematician" is derived from the Greek word "mathematikos", which was pronounced with a "k" sound. The spelling "mathematician" does not reflect this pronunciation.

The word "geography" is derived from the Greek words "geo", meaning "earth", and "graphein", meaning "to write". The spelling "geography" reflects these roots.

The word "historian" is derived from the Greek word "historia", which was pronounced with a "k" sound. The spelling "historian" does not reflect this pronunciation.

The word "philosophy" is derived from the Greek words "philo", meaning "love", and "sophia", meaning "wisdom". The spelling "philosophy" reflects these roots.

The word "theologian" is derived from the Greek word "theologia", which was pronounced with a "k" sound. The spelling "theologian" does not reflect this pronunciation.

The word "economy" is derived from the Greek word "oikonomia", which was pronounced with a "k" sound. The spelling "economy" reflects this pronunciation.

The word "ecologist" is derived from the Greek word "oikos", meaning "house", and "logos", meaning "study". The spelling "ecologist" does not reflect this pronunciation.

The word "biology" is derived from the Greek words "bios", meaning "life", and "logos", meaning "study". The spelling "biology" reflects these roots.

The word "chemist" is derived from the Greek word "khemia", which was pronounced with a "k" sound. The spelling "chemist" does not reflect this pronunciation.

The word "physics" is derived from the Greek word "physis", meaning "nature". The spelling "physics" reflects this root.

The word "mathematician" is derived from the Greek word "mathematikos", which was pronounced with a "k" sound. The spelling "mathematician" does not reflect this pronunciation.

The word "astronomy" is derived from the Greek words "astron", meaning "star", and "nomos", meaning "law". The spelling "astronomy" reflects these roots.