首先是詞性上的不同：consult為動詞，而consultant是名詞；其次是詞義：A consultant is an experienced doctor with a high position, who specializes in one area of medicine. (mainly BRIT; in AM, usually use specialist)專科醫生；A consultant is a person who gives expert advice to a person or organization on a particular subject.諮詢師；而consult作為動詞只具有諮詢和請教的意思，和consultant的第一個意思專科醫生並沒有太大的關係！

suggest 建議；提議；推薦；舉薦；使想到；使認為；表明。屬於動詞。suggest的詞形變化：第三人稱單數是suggests；現在分詞是suggesting；過去式是suggested；過去分詞是suggested。

suggest指有意或無意的，直接或間接暗示，強調事物的表徵等使人引起聯想。