Can means to be able to, permitted to or request to do something while may indicates possibility or hope.

Cache means to store away for future use while cachet means the state of being respected or having prestige.

Bring should be used when the action is directed toward the subject, while take should be used when it’s away from the subject. Bring can also mean to take something to a place.

Breach means the act of breaking a law or agreement, a gap in a barrier or to break something. Breech, on the other hand, means the lower part of something or a breech birth.

Between implies a one-to-one relationship while among implies a collective relationship. Amid, on the other hand, is usually used with mass nouns.

As an adjective, born means a specific nationality or the natural ability to do a particular thing while borne means carried or transported by something.

Amused means to find something funny while bemused means to be puzzled or bewildered.

Blatant means bad behaviour done openly or unashamedly while flagrant is a stronger word which implies the act is illegal or strongly immoral.

Awhile means for a short time. A while refers to a period of time and follows the prepositions for or in.

Bi- means two while semi- means half, meaning a biweekly meeting would be held every two weeks while a semiweekly meeting would be held twice a week. However, biannual and semiannual both mean twice a year. To say once every two years, use biennial instead.

Avocation refers to a hobby while vocation means a career.

Bi- means two while semi- means half, meaning a biweekly meeting would be held every two weeks while a semiweekly meeting would be held twice a week. However, biannual and semiannual both mean twice a year. To say once every two years, use biennial instead.

Both avenge and revenge mean to inflict harm in return for a wrong done to someone, but revenge implies the action comes out of resentment or anger. Revenge is more often used as a noun.

Biannual and semiannual both mean twice a year. To say once every two years, use biennial instead.

An auger is a tool used for boring while augur means to foretell a good or bad outcome.

Attain means to succeed in achieving something or to reach a specified size or amount. Attain implies an effort to achieve, while obtain is to gain possession of something. However, in everyday usage both attain and obtain are often treated as synonyms.

Assumption means to accept something as true which isn’t founded on strong evidence, while presumption is based on evidence which has some credibility.

Assent indicates the approval of something after careful consideration, while consent implies something is being allowed. For consent, the consenter may not necessarily be happy about the outcome.