word是单数名词，意思是单词
words是复数名词，意思也是单词，不过words前用动词are，word用is
word：n.名词
1．词，单字[C]
2．(简短的)一句话[S]
He threw in a word or twonow and again.他不时插一两句话。
3．话，谈话；言辞；歌词[S1][P1]
I can not remember the words of the song.我忘了那首歌的歌词。
4．消息，音讯；传说[U][E][(+of)][+that]
He sent word to us that he would not be able to come.他带信来，说他来不了。
5．较好贴切的字眼[theS]
6．口令；暗号[theS]
7．命令，指示[theS]
The general gave the word to execute the deserters.将军下令处决逃兵。
8．诺言[S]
He is a man of his word.他是个信守诺言的人。
9．口角，争论[P]
Sarah had words with her brother this morning.今天上午萨拉与她兄弟吵过嘴。
10．【宗】(大写)圣经，福音[theS]vt.用言词表达[O
区别：words是word的复数形式，word是单数，words是复数。
words：n，是 word的名词复数， 意思为说的话，诺言，口令。
例句：You have misconstrued his words.你误解了他的话。
word：可作为名词，意思为单词，话语，诺言，消息，也可作为及物动词，意思为措辞，用词，用言语表达，也可作为不及物动词，意思为讲话。
例句：The words stood out clearly on the page.那些字赫然写在纸上。
word可以表示“消息”或者“诺言”，如keep ones word,而words可以表示“争吵”，如have words with sb.