Root word:

TACT

Meaning of root:

TOUCH

Examples:

1. Contact - when you touch something

2. Tactile - relating to the sense of touch

3. Intact - with nothing missing

Root word:

TOX

Meaning of root:

POISON

Examples:

1. Toxic - when something is poisonous

2. Toxicology - the study of poisons

3. Intoxicated - influenced by drugs

Root word:

TURB

Meaning of root:

DISTURB, DRIVE

Examples:

1. Turbulent - causing unrest, violence, or disturbance

2. Perturb - to cause to be worried 

3. Turbine - a rotary engine actuated by the reaction

Root word:

UNDER

Meaning of root:

BELOW, NOT ENOUGH

Examples:

1. Underground - beneath the surface

2. Undermine - to excavate the earth beneath

3. Underlying - lying beneath or below

Root word:

VERB

Meaning of root:

WORD

Examples:

1. Verbal - when you talk

2. Verbalize - to put into words

3. Adverb - a word relating to a verb