menstrual cycle vs luteal phase

menstrual cycle and luteal phase both are nouns.

Word	Noun	Adjective	Verb	Adverb
menstrual cycle	Yes	No	No	No
luteal phase	Yes	No	No	No

menstrual cycle (noun)	luteal phase (noun)
a recurring cycle (beginning at menarche and ending at menopause) in which the endometrial lining of the uterus prepares for pregnancy; if pregnancy does not occur the lining is shed at menstruation	the second half of the menstrual cycle after ovulation; the corpus luteum secretes progesterone which prepares the endometrium for the implantation of an embryo; if fertilization does not occur then menstrual flow begins