名词是不是就等于形容词？

There is a high prevalence of health problems, which persist or recur after childbirth by either vaginal route or cesarean section [16]. Among them, postpartum depression and persistent pain have attracted the most attention because they may occur as a consequence of severe poorly controlled acute postpartum pain [1,18,19]. The incidence of chronic pain after cesarean section has remained largely stable in recent years with demonstrated negative impact on the patient’s quality of life [5]. Acute pain severity, independent of the type of delivery, predicted a three-fold increased risk of postpartum depression and an 2.5fold increased risk of persistent pain at 2 months after childbirth [1,9]. Two recent prospective studies also highlighted higher pain intensity on movement within 24 h post-cesarean section as a risk factor for persistent pain up to 6 months after surgery [18,19]. Not only postoperative pain intensity but also the time spent in severe pain is a risk factor for persistent postsurgical pain

阴道或剖宫产分娩后健康问题较高、易持续存在或复发。其中，产后抑郁和持续性疼痛最引起关注，因为它们可能是严重控制不佳的急性产后疼痛的结果。与分娩类型无关，急性疼痛严重程度预测产后抑郁风险增加3倍，分娩后2个月持续性疼痛风险增加2.5倍。两项前瞻性研究还强调，剖宫产后24h内活动时疼痛强度较高是术后长达6个月持续疼痛的风险因素。不仅术后疼痛强度，重度疼痛时间也是术后持续疼痛的风险因素。

Acute pain severity急性疼痛严重程度？我记得这种名词是不是就等于形容词：Acute pain severity=Acute serious pain严重的急性疼痛 ？这种语法上叫什么？