not fully aware; occurring 

below your level of thinking and awareness 

• subdue

• subconscious

• submerge

• submarine

Under the skin

• subcutaneous

• subway

• subconscious

• submerge

To bring under control

• submerge

• subway

• subconscious

• subdue

Below the point of freezing

• subfreezing

• subdue

• subordinate

• submerge

To water something from underneath the ground

• subfreezing

• subject

• subconscious

• subirrigate

To put under someone else's control

• subject

• subirrigate

• submerge

• submarine

A watercraft that stays under water

• subirrigate

• subject

• subordinate

• submarine

To put under water

• subordinate

• submerge

• subdue

• subfreezing

A person who is under someone else in rank or importance

• subordinate

• subway

• subcutaneous

• subject

A passageway under the ground; an electric underground railway

• submerge

• subway

• subirrigate

• subdue