Actual: 指事物的实际存在，并非出自主观臆造。(实际存在的，如知识、行为、价值)。
eg.The actual value of labor in capitalist society does not represent the real value of labor.
All actual objects are concrete.

Authentic: 指与事实完全相符，强调准确可靠;真的（有正式证据或文件表明）。
eg.The geologists declared the fragment to be an authentic specimen of a rare fossil.

Factual:事实的（依据事实）。
eg.The report gave a factual account of the accident.

Genuine: 普通常用词，指真正的，货真价实的，强调非人为或非虚假的;真心的。
eg.The watch is a genuine Swiss make.
He showed genuine sorrow at the death of his wife.

Real:真实的（表实际存在的，如实情、实物）。
eg.This jacket is made of real leather.
This is a real experience, not a dream.
This is a real pearl, not an imitation.

True: 指同实际情况或标准完全一致，（指语言、故事、品质等和实际情况相符）口语中多用。
eg.He is a true communist.
It is a true story.